asData improvement

asBuffer to transform UintArray to node Buffer

Signed-off-by: Fabio José <fabiojose@gmail.com>

lib/utils/fun.js

@@ -33,18 +33,39 @@ const equalsOrThrow = (v1, v2, t) =>
 const isBase64 = (value) =>
   Buffer.from(value, "base64").toString("base64") === value;
 
+const isBuffer = (value) =>
+  value instanceof Buffer;
+
+const asBuffer = (value) =>
+  isBinary(value)
+    ? Buffer.from(value)
+    : isBuffer(value)
+      ? value
+      : (() => {throw {message: "is not buffer or a valid binary"}})();
+
+const asBase64 = (value) =>
+  asBuffer(value).toString("base64");
+
 const clone = (o) =>
   JSON.parse(JSON.stringify(o));
 
 const isJsonContentType = (contentType) =>
   contentType && contentType.match(/(json)/i);
 
-const asData = (data, contentType) =>
-  ((typeof data) !== "string"
-    ? data
-    : isJsonContentType(contentType)
-      ? JSON.parse(data)
-      : data);
+const asData = (data, contentType) => {
+  let result = data;
+
+  // pattern matching alike
+  result = isString(result) && isJsonContentType(contentType)
+    ? JSON.parse(result)
+    : result;
+
+  result = isBinary(result)
+    ? asBase64(result)
+    : result;
+
+  return result;
+}
 
 module.exports = {
   isString,
@@ -64,5 +85,6 @@ module.exports = {
   isBase64,
   clone,
 
-  asData
+  asData,
+  asBase64
 };